# Longwood Fund's Biotech Investments: 27 Startups in Its Portfolio (2026) > The 27 Biotech startups Longwood Fund has backed, by stage: $2.4B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/longwood-fund-biotech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Series B 11 - [*N* Neomorph](https://millionrounds.com/company/neomorph) - [Mediar Therapeutics](https://millionrounds.com/company/mediar-therapeutics) - [AAVantgarde Bio](https://millionrounds.com/company/aavantgarde-bio) - [Sidewinder Therapeutics](https://millionrounds.com/company/sidewinder-therapeutics) - [Lassen Therapeutics](https://millionrounds.com/company/lassen-therapeutics) - [TScan Therapeutics](https://millionrounds.com/company/tscan-therapeutics) - [XyloCor Therapeutics](https://millionrounds.com/company/xylocor-therapeutics) - [Avenzo Therapeutics](https://millionrounds.com/company/avenzo-therapeutics) - [Immunitas Therapeutics](https://millionrounds.com/company/immunitas-therapeutics) - [*AB* Axial Biotherapeutics](https://millionrounds.com/company/axial-biotherapeutics) - [*KT* Khartis Therapeutics](https://millionrounds.com/company/khartis-therapeutics) ## Series A 10 - [Tome Biosciences](https://millionrounds.com/company/tome-biosciences) - [Newleos Therapeutics](https://millionrounds.com/company/newleos-therapeutics) - [Photys Therapeutics](https://millionrounds.com/company/photys-therapeutics) - [*2T* 27-8 Therapeutics](https://millionrounds.com/company/27-8-therapeutics) - [*PT* Progentos Therapeutics](https://millionrounds.com/company/progentos-therapeutics) - [*WT* Wereworld Therapeutics](https://millionrounds.com/company/wereworld-therapeutics) - [ImmuneID](https://millionrounds.com/company/immuneid) - [Solu Therapeutics](https://millionrounds.com/company/solu-therapeutics) - [Carbon Biosciences](https://millionrounds.com/company/carbon-biosciences) - [*RM* Recros Medica](https://millionrounds.com/company/recros-medica) ## Series C and later 4 - [ArcherDX](https://millionrounds.com/company/archerdx) - [Calithera Biosciences](https://millionrounds.com/company/calithera-biosciences) - [Pulmocide](https://millionrounds.com/company/pulmocide) - [Channel Medsystems](https://millionrounds.com/company/channel-medsystems) ## Stage not reported 2 - [Evommune](https://millionrounds.com/company/evommune) - [Werewolf Therapeutics](https://millionrounds.com/company/werewolf-therapeutics) ## Segment by segment ### Series B 11 startups · $1.1B raised - [*N* **Neomorph**](https://millionrounds.com/company/neomorph) United States $209M - [**Mediar Therapeutics**](https://millionrounds.com/company/mediar-therapeutics) Mediar Therapeutics is a clinical-stage biotechnology company based in Boston, Massachusetts, founded in 2018-2019. United States $161M - [**AAVantgarde Bio**](https://millionrounds.com/company/aavantgarde-bio) AAVantgarde Bio is developing gene therapies for inherited retinal disorders. Italy $141M - [**Sidewinder Therapeutics**](https://millionrounds.com/company/sidewinder-therapeutics) Sidewinder Therapeutics is a biotechnology company that offers life-saving therapies for cancer and rare diseases. United States $137M - [**Lassen Therapeutics**](https://millionrounds.com/company/lassen-therapeutics) Lassen Therapeutics is a clinical-stage biopharmaceutical company based in San Diego, California. United States $85M - [**TScan Therapeutics**](https://millionrounds.com/company/tscan-therapeutics) TScan Therapeutics is a biopharmaceutical company focused on the development of immunotherapy treatments for cancer. United States $78M - [**XyloCor Therapeutics**](https://millionrounds.com/company/xylocor-therapeutics) XyloCor Therapeutics is a bio-pharmaceutical company intended to develop gene therapy for people with advanced coronary artery disease. United States $68M - [**Avenzo Therapeutics**](https://millionrounds.com/company/avenzo-therapeutics) Developing the next generation of oncology therapies for patients. United States $60M ### Series A 10 startups · $724M raised - [**Tome Biosciences**](https://millionrounds.com/company/tome-biosciences) Tome Biosciences is a biotechnology company based in Watertown, MA, focused on advancing programmable genomic integration (PGI) to United States $213M - [**Newleos Therapeutics**](https://millionrounds.com/company/newleos-therapeutics) Newleos Therapeutics is a clinical-stage neuroscience and biotechnology company based in Boston, Massachusetts. United States $94M - [**Photys Therapeutics**](https://millionrounds.com/company/photys-therapeutics) Photys Therapeutics is a biotechnology and pharmaceutical research company founded in 2021 and based in Waltham, Massachusetts. United States $75M - [*2T* **27-8 Therapeutics**](https://millionrounds.com/company/27-8-therapeutics) United States $65M - [*PT* **Progentos Therapeutics**](https://millionrounds.com/company/progentos-therapeutics) Progentos Therapeutics develops an approach to treat multiple sclerosis that stimulates the body's natural repair mechanisms. United States $65M - [*WT* **Wereworld Therapeutics**](https://millionrounds.com/company/wereworld-therapeutics) United States $56M - [**ImmuneID**](https://millionrounds.com/company/immuneid) ImmuneID is a precision immunology company. - $50M - [**Solu Therapeutics**](https://millionrounds.com/company/solu-therapeutics) Solu Therapeutics is a Boston-based clinical-stage biotechnology company focused on developing precision medicines to target and e United States $41M ### Series C and later 4 startups · $427M raised - [**ArcherDX**](https://millionrounds.com/company/archerdx) ArcherDX is a biotechnology firm specializing in cancer research. United States $150M - [**Calithera Biosciences**](https://millionrounds.com/company/calithera-biosciences) Calithera Biosciences is a pharmaceutical company developing novel small molecule therapeutics for the treatment of cancer. United States $115M - [**Pulmocide**](https://millionrounds.com/company/pulmocide) Pulmocide is a private biopharmaceutical company based in London, United Kingdom, founded in 2007. United Kingdom $110M - [**Channel Medsystems**](https://millionrounds.com/company/channel-medsystems) Channel Medsystems is a medical device company offering cryotherapy devices for endometrial cryoablation. United States $52M ### Stage not reported 2 startups · $175M raised - [**Evommune**](https://millionrounds.com/company/evommune) Evommune is a biotechnology company that develops therapeutics that halt progressive disease and address their symptoms. United States $125M - [**Werewolf Therapeutics**](https://millionrounds.com/company/werewolf-therapeutics) Werewolf Therapeutics operates as an oncology biotherapeutics company. United States $50M **How this map is made.** Every startup here works in Biotech and has raised money in a round we track that names Longwood Fund as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Co-investors **Who invests with Longwood Fund** 27 co-investors](https://millionrounds.com/portfolio-maps/longwood-fund-co-investors)[Sector portfolio **Techstars' AI portfolio** 336 startups · $4.9B](https://millionrounds.com/portfolio-maps/techstars-ai-portfolio)[Sector portfolio **Alumni Ventures' AI portfolio** 302 startups · $36B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-ai-portfolio)[Sector portfolio **Andreessen Horowitz's AI portfolio** 259 startups · $426B](https://millionrounds.com/portfolio-maps/andreessen-horowitz-ai-portfolio)[Sector portfolio **General Catalyst's AI portfolio** 226 startups · $179B](https://millionrounds.com/portfolio-maps/general-catalyst-ai-portfolio)[Sector portfolio **Sequoia Capital's AI portfolio** 209 startups · $543B](https://millionrounds.com/portfolio-maps/sequoia-capital-ai-portfolio) ## Raising from investors like Longwood Fund? 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